Sex and age-specific survival and life expectancy in a free ranging population of Indri indri (Gmelin, 1788).
Authors
Rolle, FrancescaTorti, Valeria
Valente, Daria
De Gregorio, Chiara
Giacoma, Cristina
von Hardenberg, Achaz
Affiliation
University of Turin; University of ChesterPublication Date
2021-07-22
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The critically endangered indri (Indri indri) is the largest extant lemur species and its population size is projected to decline over the next three generations due to habitat loss, hunting and climate change. Accurate information on the demographic parameters driving the population dynamics of indri is urgently needed to help decision-making regarding the conservation of this iconic species. We monitored and followed the life histories of 68 individually recognizable indris in 10 family groups in the Maromizaha New Protected Area (Madagascar) for 12 years. We estimated age and sex-specific survival trajectories using a Bayesian hierarchical survival model and found that the survival curves for male and female indris show a similar pattern, consistent with what found typically in primates; i.e., a high infant mortality rate which declines with age in the juvenile phase and increases again for adults. Also, life expectancies at 2 years of age (e2), were found to be similar between the sexes (e2 females = 7.8 years; e2 males = 7.5 years). We suggest that the lack of strong differences in the survival patterns for male and female indris are related to the strictly monogamous mating system and the lack of sexual dimorphism in this species. Our study provides, for the first time, robust estimates for demographic parameters of indris and one of the very few datasets on survival trajectories available for primates.Citation
F. Rolle, V. Torti, D. Valente, C. De Gregorio, C. Giacoma & A. Von Hardenberg (2021) Sex and age-specific survival and life expectancy in a free ranging population of Indri indri (Gmelin, 1788), The European Zoological Journal, 88:1, 796-806. https://doi.org/10.1080/24750263.2021.1947398Publisher
Taylor & FrancisJournal
European Zoological JournalAdditional Links
https://www.tandfonline.com/doi/full/10.1080/24750263.2021.1947398?scroll=top&needAccess=trueType
ArticleDescription
This is an Accepted Manuscript of an article published by Taylor & Francis in European Zoological Journal on 22 July 2021, available online: https://doi.org/10.1080/24750263.2021.1947398ISSN
No print ISSNEISSN
2475-0263ae974a485f413a2113503eed53cd6c53
10.1080/24750263.2021.1947398
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